mine is not working toomaybe i connected it wrong to the arduino or maybe it doesnt support 5volts or maybe the skecth i used was wrong, or maybe the files must be mp3. There are very few informations on this module combined with arduino.

i used this scheme (except for the 5v power) to connect it to analog A3 A4 A5arduino pins

Tried mp3 control mode, as I told you via pm and did not work cause the module is hardwired to work 2 serial line mode. I am also using "kingstone" micro sd card brand. I am pretty sure they are fake, but vendor told me that any brand will be fine.

Will test all this night, but I am pretty sure this module will only play certain ad4 and Wav files encoded in the right rate. As read in other websites, this one and somo-14d shares the same IC so connection diagram should be fine, even the sketch program should be correct. Your problem was the Vcc and mine the connection. Keep you posted. We are in the same boat. And If anybody have this working, we will really appreciate any help.

Will test all this night, but I am pretty sure this module will only play certain ad4 and Wav files encoded in the right rate. As read in other websites, this one and somo-14d shares the same IC so connection diagram should be fine, even the sketch program should be correct. Your problem was the Vcc and mine the connection. Keep you posted. We are in the same boat. And If anybody have this working, we will really appreciate any help.

i used the somo tool to create the ad4 filehttp://www.4dsystems.com.au/prod.php?id=74

Did all the test using almost every code available and got a few conclusions. A pins are only analog inputs, so you should use any other digital output ( example: 2,3,4 for reset,clock,data). When I turn on the WTV020-SD-mini-16P, the busy light blinks quickly and after a second of so keeps on. I connected the reset, clock and data and reset the board at the setup portion of the code. You should put the rst pin for 5ms down and later wait 300ms before send any command. I noticed that this guy, was able to do something with the WTV020-SD-20s board:

http://www.vduenasg.blogspot.com.ar/2012/03/wtv020-sd.html

He modified the clock timing, from 200us to 50us to make it work. So, basically I am pretty sure that now is a software problem with the data and clock pins, since I believe the rst function is working. A out the 3.3v problem, the manual states that you can connect two N4007 diodes in serial from a 5v output power. Did not test it yet. Will be playing with this modified code:

Hurray, good for you. I just heard a small noise. What do you mean you turned the pins to Analog? Are you still using A pins as clock, rst, and dta?You were using Arduino nano right? Ask you this cause since I am using UNO, will have to put some resistors between rst,clock and dta pins. Cause UNO high value is 5v and I think WTV020-SD-16P is 3.3v.